Changes in version 0.3.1                        

  - Add preview_pptx() function to preview PowerPoint presentations in
    html using a modified version of PptxViewJS
  - Update ggplot.placeholder_tbl() to print placeholders in order of
    side to try to help preview shapes and prevent larger placeholders
    being placed over smaller ones
  - Update error handling when invalid content are put into
    update_slide() and add_slide() to throw error when it is invalid.
    Still has ability to continue if polishing fails.
  - rename package from "mirage" to "powerup"
  - rename options/settings to use "powerup"

                        Changes in version 0.3.0                        

  - Open Source the package

                        Changes in version 0.2.3                        

  - remove_slide_ph() handles ph_id = NA gracefully #95.

  - update_slide() and add_slide() capture and remember last error,
    which can be retrieved with the new slide_errors() function (#56).

  - delete_slide() and move_slide() change the document revision #101

  - New internal function get_layout_names() to retrieve the names of
    all the slide layout at once (#100).

  - The keep_all= argument now defaults to FALSE in list_placeholders()
    and list_layout_placeholders() (#104).

  - The add_slide(layout=) argument becomes mandatory #107.

  - read_layout_placeholders() and read_slide_placeholders gain a
    keep_all argument that defaults to FALSE #112

  - New function extract_metadata_element()

  - The data returned by read_slide_placeholders() gains a "dimensions"
    attribute.

  - list_slides() works correctly with slides that have no placeholders
    and has a n_slide_ph column.

  - option "mirage.inform" can be set to "console" (default), or "shiny"
    so that inform messages are shown as shiny notifications.

                        Changes in version 0.2.2                        

  - Add ability to move slides (move_slide()) and delete slides
    (delete_slide())

  - Add ability to create slide transitions via slide_transitions_*()
    family of functions and the transition argument in add_slide() and
    update_slide()

  - Add ability to remove contents from a slide via remove_contents()

  - New function check_pkg_version(), in the code that it generates to
    gently check package versions and inform() if a version is not
    recent enough to be sure this all works #92.

                        Changes in version 0.2.1                        

  - list_placeholders() gains a keep_all argument.

  - Fix bug from replacing values previously added content

  - Add default functionality to group multiple outputs from polishing
    into a single grpSp so powerup sees all the content as one
    placeholder.

  - Update to not allow for duplicated Placeholder names and update for
    when placeholder names are loaded in they are made unique.

                        Changes in version 0.2.0                        

  - list_slides() gains the $slide_file column and only returns one row
    per slide.

  - get_slide_file_name() is exported.

  - add_table_style(), new_table_style() are added. lets users create a
    new table style format and add it to the powerpoint. This can then
    be used to style tables as they are added to the powerpoint, or when
    the powerpoint is open.

  - get_table_styles() is exported. Lists the available table styles in
    the powerpoint

  - tint_color() is exported. Lets users apply a tinting % to a color.

  - Bug fixes and test updates from officer 0.6.7 release.

                        Changes in version 0.1.0                        

  - Initial version of mirage

  - load_pptx() and save_pptx() to respectively read from disk and save
    to disk powerpoint files using the custom pptx_container class that
    extend the pptx objects from {officer}.

  - add_slide() to add a slide with a given layout to an existing
    presentation and optionally add displays.

  - update_slide() to add one or more displays to a given slide
    identified by its number.

  - content() to wrap an object that can be polished through
    polish::polish_content_pptx(), a placeholder and optionally some
    metadata.

  - ph_*() to create placeholder specifications to target either
    existing placeholders from the slide or layout, or to create new
    placeholders given position on the slide.

  - ref_placeholder() to construct a placeholder specification that aims
    to find an existing placeholder on a slide or its layout.

  - new_placeholder() to construct a specification for a new
    placeholder.

  - templated_placeholder() to wrap existing (preferred) and new
    (fallback) placeholders. All the ph_*() functions are in fact
    templated placeholder specs.

  - list_layouts() to retrieve information about the available layouts.

  - list_slides() to retrieve information about each slide.

  - list_placeholders() to retrieve information about placeholders on a
    given slide or available as part of a layout.

  - read_slide_placeholders() lower level function to read placeholders
    from a slide.

  - remove_slide_ph() to remove a placeholder from a slide.