LT-13799, long delays on some computers

Hotfix copied from feature with same name

Change-Id: I577be9143f88a04607398c0d2c03d2e2b6988249
Stop disposing a dialog while showing it

This fixes FWNX-983 "My FW project always hangs whenever working with
'Find in Dictionary' function".  The program freezes up in Mono when a
dialog is disposed while it is in the ShowDialog method.  I still can't
believe this didn't cause problems on Windows!

Change-Id: Ic4a9ca9aa5b5539552d3fbca7cfbfc0026b43cbf
Use FW_ROOTCODE to find strings-en.txt

This fixes FWNX-938, FWNX-939 and possibly other issues.  When the C++
string resource file cannot be loaded, this can cause BeginUndoTask to
be called with empty strings, which throws an exception and leaves the
program in an unstable state.  (This bug was very hard to track down
because developer builds always found the string resource file in
Output/Debug, the universal working directory used by programmers when
running the program!)

Change-Id: I7ccead524c5a942a0ad3cd32c2bfd504ee182eee
Fix extremely slow update of Semantic Domain List display

This fixes FWNX-973 "Semantic domain search box is blinking After search
a 'GAILS' then remove some letters" and FWNX-1043 "Typing any letter ...
in the search box in Collect Words-->Semantic Domains view takes
approximately 1 minute 29 Seconds for filtering the text".

Change-Id: I3b503b39e5ebd77d7861f49a0bdf3e174cde5011
Merge branch 'release/7.3-gial' into master
Merge branch 'release/7.3-gial-Linux' into support/7.3-gial-Linux
Add CcEC.dll.config so that Consistent Change works

This is needed for proper execution by encoding converters that use
Consistent Changes.  This is a partial solution to FWNX-1055.

Change-Id: I0785500233f72ecc80066cf1260579a5a8aec883
Use system-specific Palaso assemblies

The Palaso libraries have a fair amount of '#if MONO' conditional
compilation in the source code, thus requiring separate Windows and
Linux versions of the assemblies.  This fixes FWNX-1054 (and FWNX-1051
as well since the Linux Lift.Media.dll has fixes for handlng sound files
better).

Change-Id: I36bad7db5f8023b5bda59c449df323a5c17df50f
Merge branch 'support/7.3-gial-Linux' into develop

Change-Id: I1b4291a4d9e637755943ae72ddc3fdf14a41be8e