This changes indexing so that a.b now indexes as "a", "b" AND "a.b"
instead of just the first two, for periods and hypens, so terms
containing those characters can be searched within.
Adds hypens as a delimiter - #2095
Due to hitting statement placeholder limits (typically 65k)
when inserting index terms for single page.
Added test to cover.
Also added skipped tests for tests we don't always want to run.
For #5322
Adds a thin wrapper for DOMDocument to simplify and align usage within
all areas of BookStack.
Also means we move away from old depreacted mb_convert_encoding usage.
Closes#4638
Dan Brown
inv-hareesh