Windows: Drop support for obsolete MinGW

Partial revert of #10380 based on contributor ~~bullying~~ feedback.

The version we support is MinGW-w64: https://sourceforge.net/p/mingw-w64
The old original MinGW from which it was forked (https://sourceforge.net/projects/mingw),
is no longer maintained and useless for us.

Fixes #10396.

Upstream bug report: https://sourceforge.net/p/mingw-w64/bugs/460/

Fixes #10403

We need the efficient SRWLock methods which are not supported on Vista,
and loading them dynamically while providing fallbacks is not worth the
effort. Closes #10243.

Sorry Vista users... As you are running a supported which is no longer
supported by Microsoft (https://support.microsoft.com/en-us/help/13853/windows-lifecycle-fact-sheet),
we can only encourage you to upgrade to a more recent version if you can,
or switch to Linux, which should give your old hardware a new youth.

-Changed the way objects are marshalled and sent to the debugger
-Editing debugged objects happens in the remote inspector now

Add closest_power_of_2 func and implement mix_rate/latency on OS X

Rename `XL_MESSAGE`/`tr` to `localize`

Several improvements and fixes to import system. Might fix many issues opened, but have to check in detail..

Removed unused variable

Fixes #10399.

Also renames `set_message_translation` to `set_message_localization`
for consistency.

Fix progress dialog's bars overflowing.

Reworked change_dir to support symlinks

Fix particles emitting when emitting is set to false in scene

Fixed OUYA Game Controller for 3.0

[ci skip]

Fix/improve property evaluator

Input_default.cpp has been updated for the OUYA Game Controller to work
with fixed and functional mapping for Godot 3.0

Evolution of #10366 based on what has been discussed there.

Now you can refer to the relevant object either by `self` or `s`.
No conflicts with a potential `tool` script attached to the object.
Proper cleanup since a dummy object is used to have an instance and the temporary script dies with it.

Caused by #10297 calling particles_restart() on the same frame as the one set_emitting(false) is called. The rasterizer would wait a frame, and then set emitting back to true.

Based on e513ecb7a14560d7238408a16a3b855863fd6df9.

Some method fixes

Added Tile and TileFit to StyleBoxes

Better flat stylebox with rounded corners

Show Anchor even when Control-Node is hidden

Fixes #10244.

Updated function argument names

Fixing blinking particles at 0 initial velocity.

Scroll bars now look different on press

Exposed create_from_mesh in Navmesh

spatial selection if subscene geometry is far from origin