Bidi Neutral Directionality Paragraph Start

Mitz Pettel contributed this fix to KDE, and now we're rolling it in. Here's his explanation:

The directionality of a neutral character at the beginning of a paragraph (or after a hard line break) is decided incorrectly if the first non-neutral character in the paragraph has directionality opposite to the paragraph directionality. For example, if the paragraph direction is LTR, the first character on the paragraph is a question mark and the next one is a Hebrew character, then the question mark will is considered right-to-left and appears to the right of the Hebrew character.

The rule to follow is 3.3.4.N2 in the Unicode Standard's Bidirectional Algorithm http://www.unicode.org/reports/tr9/#Resolving_Neutral_Types.

If the test is successful, the question marks should be on the far left and far right of the next two paragraphs.

? ﺲ ﻭhello

? hello ﺲ ﻭ