[update] update to upstream 5.1.0-beta1
Squashed 'qtgraphicaleffects/' changes from a567c47..bd434a6

bd434a6 Add license files mandated by (L)GPL.
b92e267 Merge remote-tracking branch 'origin/release' into stable
23a1dc2 Bump MODULE_VERSION to 5.1.0
afd0574 Merge branch 'dev' into stable
8175793 Merge remote-tracking branch 'origin/release' into stable
db42892 Merge remote-tracking branch 'origin/stable' into dev
b87ed76 Propegate "transparentBorder" to the correct ShaderEffectSource
b4ac3d7 Merge remote-tracking branch 'origin/stable' into dev
0bd009d Merge remote-tracking branch 'origin/stable' into dev
04a4946 sync.profile: Point dependencies to 'refs/heads/dev'

git-subtree-dir: qtgraphicaleffects
git-subtree-split: bd434a6ea358e96c373e3ad65bfb6d939904abf5
Merge commit 'a0ec24c6ad18919bcbd6190f0c395cf337420eee'