[jsx] Indent contents of classes consistently
[jsx] Indent contents of classes consistently

Add one indent level while inside the class, so methods are indented
one level, and use "~M" rather than a hard-coded 4 space indent for
member variables.

snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball,snowballstem/snowball