Merge pull request mozilla#13172 from Snuffleupagus/cleanup-keepFonts

[api-minor] Add an option, in `PDFDocumentProxy.cleanup`, to allow fonts to remain attached to the DOM

Merge pull request mozilla#12897 from calixteman/12895

JS - Fix mouse event names

Merge pull request mozilla#12321 from Snuffleupagus/BaseViewer-valida…

…te-viewer-option

Ensure that the `viewer` property, on `BaseViewer`-instances, is a valid div-element (issue 12320)

Merge pull request mozilla#11947 from Snuffleupagus/GlobalImageCache-…

…assert-not-inline

Ensure that that we don't attempt to cache *inline* images in the `GlobalImageCache` (PR 11912 follow-up)

Merge pull request mozilla#11716 from Snuffleupagus/private-PDFPagePr…

…oxy-pageIndex

[api-minor] Change the pageIndex, on `PDFPageProxy` instances, to a private property

Merge pull request mozilla#11187 from Snuffleupagus/image-Error-classes

Convert the various image decoder `...Error`s to classes extending `BaseException` (PR 11185 follow-up)

Merge pull request mozilla#10949 from Snuffleupagus/delay-findControl…

…ler-init

Delay initialization of searching, in the viewer, until the first page has rendered

Merge pull request mozilla#10539 from Snuffleupagus/fallback-disableF…

…ontFace-v2

[api-minor] Fallback to the built-in font renderer when font loading fails

Merge pull request mozilla#10179 from ThomasdenH/patch-1

Change splice to pop in annotation tests

Fix webpack exclude path on windows.