[Mac] #967 - Make platform tests case-insensitive and support invert logic.

[windows] Fixes IKeymanControl::OpenConfiguration giving noop

[Mac] #931 - Made anything that appears to be "LibreOffice" use legacy

Any unrecognized platform tokens will cause it to return false (not a match).

[ios] Frozen keyboard in latest beta

Tweak history.md

[Developer] Update to Unicode 11.0

[ios] If a keyboard.json has no timezone in the last modified date string, then it will still install

Fixes #510. If a keyboard.json has no timezone in the last modified date string, then it will still install

[ios] Cleaning up constraint violations and confused keyboard resizing code

Fixes #976

Update to Unicode 11.0 characters from ftp://ftp.unicode.org/Public/11.0.0/ucd

[web] Build initial test case for #978

History.md and updated platform test report

[Windows][Android][Web] Platform statement consistency fixes

Reworked several aspects of platform constraints esp. regarding unknown constraints. Rewrote keyboard and spreadsheet to facilitate testing more reliably.

[Android] Consolidate "Info" views

Fixes #960

Previously, the InfoActivity was displaying the app version in one view, and launching the help content in another Activity.