Allow Label to wrap at specified characters

This commit provides the option to specify additional break characters.
ParticleEditor: relative path for emitter's image

If image for emitter is located in the same directory as effect file, or in a subdirectory, then path to this image will be saved as relative to the effect file
Check isBreakChar in getWrappedBounds
Merge pull request #2492 from jpilfold/master

Allow Label to wrap at hyphens
Merge pull request #2679 from alex-dorokhov/particle-editor-relative-path

ParticleEditor: relative path for emitter's image
convert touch to root-local coordinates
Merge pull request #2680 from vmilea/root_transform

Wrong stage-to-local transform when the root is not identity
MeshBuilder: don't default to GL_POINTS (0), add end(Mesh) method (see #2156) as well as getNumVertices()/getNumIndices(), run formatter
Merge branch 'master' of https://github.com/libgdx/libgdx
Update CHANGES
MeshBuilder: move vertex transformation (position, normal, color and UV) to the addVertex method so it is applied to all added vertices (required for separation of concerns)
Enforce touchable attribute for Stage root
Add Mesh#getIndicies(srcOffset, count, ...), add MeshPartBuilder#addMesh(...), see #2156
Send correct arguments to texSubImage2D

Fixes #2672
Only transform if needed
Merge branch 'master' of https://github.com/libgdx/libgdx
SuperDev button returns
Added another JSON test.
Fixed randomTriangular(min,max).
Merge pull request #2682 from vmilea/root_touchable

Enforce touchable attribute for Stage root