-Added an optimization so physics shapes are configured later, speeds up grid map loading and editing

Xananax and Thomas/karroffel make a joint donation.
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Based on the patrons for August 2017 on Patreon.
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Following #10903 and #10906.

Prevent sending MainLoop notifications before initialized

-Fixed refactoring tools to work with imported scenes (properly move .import files)

Fixes order of default arguments in MethodInfo

DocData: Include enum attributes in return nodes

This time for real

Removed empty segment

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Fixed jitter when scrolling up

Fix typos 'a' and 'an'

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Adding @groud, @ISylvox, @endragor, @Rubonnek, @bruvzg.
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add shadow_filter variant PCF7

Lots of changes due to new MethodBind logic, a few issues here and there
that will need to be fixed later on (wrong default values, imprecise return types).

Fix missing pragma push

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I forgot to pragma push the ignored warning in #10877 this adds the
missing ones.

Fix use of unitialized variables

The second in my quest to make Godot 3.x compile with -Werror on GCC7

Fix signed and unsigned comparisons

Fix crash when destroying AudioStreamPlaybackOGGVorbis

Corrections to audio buffer size calculations

Fix typo 'begining' to 'beginning'

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Regression from 6fa61495.

etc: Append -std=gnu++11 to CCFLAGS instead of CXXFLAGS

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Fixes reversed order of default arguments in MethodInfo

This way it can override the -std flags passed to scons.