[Developer] Support drag and drop into monaco editor from Character Map

[Developer] First pass of managing code and char fonts in web text editor

[Developer] Add basic monarch syntax highlighting for .kmn

[Developer] Replace ACE editor with Monaco

[Developer] Prevent web requests from breaking out of our root path with ../

[Android] Add splash screen

Per review comment, don't delay app startup  just to display the text fields of the splash screen.

[Developer] Add FindErrorByOffset support for future use by JSON, XML editors

This addresses the Android platform of #1069

* Show product logos on app start
* Then show text (version and copyright dates)

[Developer] Maintain selection in web editor when saving or refreshing text

[Linux] Basic groundwork for kmflcomp to support v10 keyboards

[Developer] Show selected character range in character preview window, not just first character

[Developer] Re-implement Convert-to-character command in web text editor

[Developer] Track deadkeys more reliably in debugger

[Developer] Support CSS, JS and JSON formats in text editor

[Developer] Project window needs to support untitled projects

[Developer] Support printing from ACE text editor

[Developer] Tidy up row selection in web editor