No need for RTL_USING in addition to LIBO_INTERNAL_ONLY

Change-Id: Iaa65658aed6bb4abb20a4d95dc9c6caf7c1c764b
No need for RTL_FAST_STRING in addition to LIBO_INTERNAL_ONLY

Change-Id: I5514898f588b21bafceefca95e3276826cb9a882
This is not java.lang.StringBuffer

Change-Id: Iea1ebb8ec79647b279fde359aa4d617d9c360e56
Make O[U]StringLiteral ctor explicit

Change-Id: Ide8b167d544447dd6844f5249fe6831ef4d2b4eb
sc: Use appropriate OUString functions on string constants

Change-Id: Iefc8dcb25dd32acbc435bbf2aaa63572915d6753