Reduce usage of memory-leaking Context object

Huge refactoring of the methods to use the passed instance of the
Context object instead of using the static one. I couldn't completely
remove the static object, because it requires restructuring of the
workflow so that it originates from the activity, and not from some
other random place. The way it was refactored is:

1. Find a place where the static object
(LibreOfficeMainActivity.mAppContext) is used.
2. Add a LibreOfficeMainActivity object to the method signature.
3. Repeat the process with a method that calls it, and repeat until
the LibreOfficeMainActivity object isn't available, so that it can be
passed through all the methods, to the place where the static object
was used.
4. Replace that static object with the parameter of the function.

The commit looks pretty huge, but it's basically just the simple
refactoring explained above. The memory leak isn't completely gone,
but this a progress towards it. Also moved the "global" objects of
Handler and LOKitThread from an Activity to an Application, which
is the correct place for "global" variables. Can someone explain why
Handler and LOKitThread are used? They seem to mostly do nothing, but
steeply increasing the complexity of the application.

Change-Id: Ib2be77fa3adea94d6b7849d0e2afa90bf318d68b
Reviewed-on: https://gerrit.libreoffice.org/33073
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Aleksandar Stefanović <theonewithideas@gmail.com>

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