tinyexr: Sync with upstream 4dbd05a + enable C++11 threaded loading

Recast: Update to upstream commit 57610fa (2019)

pcre2: Update to upstream version 10.34

stb_vorbis: Update to upstream version 1.19

Drop now unused curl_hostcheck.c

FastLZ: Update to upstream version 0.5.0

Improve shader time roll over

Changelog: https://vcs.pcre.org/pcre2/code/tags/pcre2-10.34/ChangeLog?view=markup

1.19 - 2020-02-05 - warnings
1.18 - 2020-02-02 - fix seek bugs; parse header comments; misc
                    warnings etc.

One less thirdparty library to document \o/

Upstream development restarted after 13 years. Changes:

2020-02-02: Version 0.5.0

    Minor speed improvement on the decompressor.
    Prevent memory violation when decompressing corrupted input.

2020-01-10: Version 0.4.0

    Only code & infrastructure clean-up, no new functionality.

- Resurrect it for GL ES 2
- Add it to the Vulkan rasterizer
- Expose the setting from the `RenderingServer`, since it does not belong in any specific rasterizer

enet: Update to upstream version 1.3.15

Document the formats supported by `Image.load()`

Don't focus the selection after using Align Transform With View

Fixed false positives in the culling system (master branch version).

This fixes numerous false positives coming out of the culling system.

AABB checks are now a full separating-axis check against the frustum, with the points of the frustum being compared to the planes of the box just as the points of the box were being compared to the planes of the frustum. This fixes large objects behind the camera not being culled correctly.

Some systems that used frustums that were (sometimes mistakenly?) unbounded on one or more side have been modified to be fully enclosed.

Dual paraboloid shadowmaps were ending up with infinitely large volumes of area behind the hemisphere un-culled.

This change just adds a back plane to the convex shape used for the culling volume.

Fix growMargin() not returning modified Rect2/Rect2i in Mono

This partially addresses #32166.

Fix leaked objects when game ends with yields in progress

Fixes SkeletonIK resetting other IK poses

Fix for marking assert lines as safe bug

Warn when trying to open `res://` or `user://` with `OS.shell_open()`

Add "undo_max_stack_size" property to TextEdit

[Core] [Mono] [GDNative] Rename "linear_interpolate" methods to "lerp"

It made minor adjustments difficult as the camera moved every time
Align Transform With View was used.

This closes #36738.

RasterizerStorageRD: Don't override format value

Made the search results more specific.

doc: Improve Node2D to_local/to_global description

The stack size of the undo history of a TextEdit was not limited leading
to potential memory leaks when doing lots of operations on a TextEdit.

This commit adds the option gui/common/text_edit_undo_stack_max_size
to the project settings. The first element of the undo stack is popped
if the stack's size exceeds this value ensuring limited memory usage.

The default stack size setting is 1024.

Fixes #37838.

Add option for editor freelook camera sensitivity

When finding a substring, the rating is biased towards substrings
at the end of the path.

Fixes #33504.