[Web] OSK bulk renderer

[Common] refactor path

[linux] backspace

in case there are other actions like INVALIDATE_CONTEXT after it

[linux] ibus-keyman test program

[linux] set GTK_CFLAGS and GTK_LIBS for make dist on jenkins

[Windows] Tweak vertical scaling for characters that may overflow OSK key boxes (e.g. Tai Dam)

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Will compile on Windows now and switch to normalised paths.

[linux] ibus keyman fix most things that failed using kmx test keyboards

[Developer] Update kmcomp to migrate languages[] array

[Web] OSK key generation refactor

[linux] put underlying base "us" keyboard into LDML

[Windows] Use RegisterHotkey to (a) simplify hotkeys and (b) avoid serialization issues with modifiers

use sleep to slow down keypresses to more natural level
at full speed ibus_set_surrounding_text events were coming in
which got text 1 or 2 keypresses behind

changing the timing also allows initial context to work so
re-enabled test 5

all 20 tests now pass :)