pip: enhance css

Conflicts:
	src/plugins/pip/pip.js
core: add player autoresize on window resize when stretch parameters are set
pip: remove masterToPip animation for all containers, not only for hls

Conflicts:
	src/plugins/pip/pip.js
hls: turn hd on for bitrates greater than 2500k
pip: change master z-index
pip: fix z-index
pip: fix setMasterContainer bug that doesnt call pipToMaster on container:ended

Conflicts:
	src/plugins/pip/pip.js