Make loadSafeLabel a generic facility as makeSafeForPresentation

Any app loading untrusted strings should make the strings face. Hence make
the method publicly available.

Test: atest CtsTextTestCases:MakeSafeForPresentationTest GtsContentTestCases:PackageItemInfoTests
Change-Id: Ib0679fe892181535339dac77583c427e0d64dd05
Fixes: 113856697
4 files changed