Enhance text rendering

[ftlPhysicsGuy]

This provides several modifications, primarily in FontOutlines.cs, that enhance text rendering as follows:

1. Adds a depth option for stacking text in z
2. Draws text strings that enter from outside the frame, which were not being drawn before
3. Replaces linq expressions (for look-ups and list creation) with faster methods

Reviewing the files before submitting this pull request, I noticed I had left fields that were used during testing. The following lines in FontOutlines.cs can be removed from this request:

    // Oops -- Remove these fields that were used during testing
    long totalDrawTextTicks = 0;
    int totalDrawTestCalls = 0;
    double baselineTicksPerCall = 0;

[codecov[bot]]

Codecov Report

Merging #217 (52d0460) into master (a37721c) will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #217   +/-   ##
======================================
  Coverage    3.16%   3.16%           
======================================
  Files          90      90           
  Lines        3697    3697           
  Branches      657     657           
======================================
  Hits          117     117           
  Misses       3575    3575           
  Partials        5       5           

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[dwmkerr]

Another great addition thank-you!