Removes one more dependency on Delphi tools

While it may be smarter to move to a different build system altogether,
it is also a *lot* more work. This was a fairly minor syntax refresh to
get nmake working with our existing Makefile system. This is now no
longer compatible with Borland make, so you will need to use `nmake` to
build.

The presence of NMAKE.md informs builds systems that nmake should be
used instead of make.

auto: increment master version to 15.0.162

chore(linux): Remove lintian warning 📦  🍒 

chore(linux): Allow to specify debian revision 📦  🍒 

auto: increment master version to 15.0.161

This change allows to specify the debian revision when creating
source packages for Debian.

Lintian complained "missing-build-dependency-for-dh-addon" which
I'm not entirely sure is correct. However, there is an easy
workaround by removing an unnecessary parameter.

chore(linux): add non-surrounding-text feature to tests 🎫

When our context buffer is too small we now properly move the
content by a full xstring unit so that we don't end up with the
buffer starting with an invalid sequence (half of a dead key or
surrogate pair).

This change refactors two tests to no longer rely on obscure internal
knowledge. This allows the tests to also run in ibus-keyman.

This also fixes a failing test (`048 - modifier keys keep context`)
if surrounding text is not supported. If the user presses the
capslock key we shouldn't reset the context if no rules match.

Fixes #5613.

chore(common): add more description to Buf method

Also updated the doxy to remove the brief tag.
Made mirror change to appint.h

fix(developer): building kmw keyboard had wrong message callback signature

auto: increment master version to 15.0.160

fix(android/engine): Fix font paths

chore(android): Document switching to other system keyboard

fix(developer): debugger crash with empty group

As the array length properties are unsigned integers, taking -1 from
them resulted in an integer overflow when the array was empty. A gotcha
with Delphi-style for loops!

auto: increment master version to 15.0.159

chore(android): Specify build tools version on other projects

feat(android/engine): Add other IME's to the Keyboard Picker menu

auto: increment master version to 15.0.158