make TestMorph (in jme3-examples) more user-friendly

Update checkout action to v2

Fix for resizing the window (issue 1191) (jMonkeyEngine#1308)

* Listen for framebuffer size callbacks and set the resolution from that

* Also check the window size on the framebuffer size callback

com.jme3.scene.shape.Line: protect the no-argument constructor (jMonk…

…eyEngine#1234)

gradle.properties: ready for 3.3.0-alpha5 build

gradle.properties: ready for 3.3.0-alpha4 build

gradle.properties: ready for 3.3.0-alpha3 build

gradle.properties: ready for 3.2.4-stable build

trivial commit with tag for v3.3.0-alpha2

trivial commit with tag