[mapguide][MG112][New] Fixing build warnings introduced by MG42

[Thomas M. Tuerke]

You can view the artifact detail at the following URL:

    https://mapguide.osgeo.org/servlets/Scarab/id/MG112

Type
 Defect

Artifact ID
 MG112 (Fixing build warnings introduced by MG42)

Reported by
 Thomas M. Tuerke
 thomastuerke (thomas.m.tuerke at autodesk.com)

New artifact details:
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- Developer Notes set to new value
  Most of the new warnings rest on the use of type int instead of type size_t (or equivalent,) and for these, two approaches were taken:
* In the case of STRING::find and STRING::length, the results are now kept in a STRING::size_type (other cases use size_t explicitly.)
* In the cases where it's convenient to retain int-like just-before-the-beginning state, a typedef is used to embody this behavior; the use of an unsigned size type made the logic particularly obtuse.
- Description set to new value
  Changes to HttpHandler.vcproj introduced new compiler warnings (via Detect64BitPortabilityProblems="true" et al.) which are mitigated by changes to code in this submission.
- Steps to Reproduce set to new value
  Build HttpHandler project
- Priority set to new value
  P2
- Artifact created
- Component set to new value
  Web Server Extensions
- Related Artifacts set to new value
  MG42
- Version set to new value
  1.0.0
- Defect Severity set to new value
  Low
- Summary set to new value
  Fixing build warnings introduced by MG42
- Status Explanation set to new value
  Code cleanup motivated by compiler warnings indicating questionable practices, in general impairing 64-bit portability.

Earlier project file changes also introduced a bug where a member pointer wasn't being explicitly initialized (and no compiler warning was generated, either....)  Previous project settings implicitly did this, letting the condition go unnoticed.  Not addressing this caused MapAgent to access illegal memory addresses, causing a crash.
- Subcomponent set to new value
  OGC Interface
- Artifact Status set to new value
  New

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