Summary Page (Version 2); Wiki Text now preserves white space more accurately

Previously, any Wiki Text values added to an ISSummaryTable would ignore consecutive spaces when converting to HTML (this is as per normal HTML behaviour).

The finHtmlSummaryPage2StringBuilder.ParseWikiTextSimple method now treats consecutive spaces as HTML non-breaking spaces, thereby formatting preserving any indentation in the Wiki Text value achieved by adding multiple spaces.

E.g., the following will now use non-breaking spaces and therefore indent "My Text" by four spaces rather than the single space that would have been visible in previous versions:

SummaryTables.Rows.Add().Cells.AddWiki("    My Text")