Improve allocations when loading text format fonts about cyotek.drawing.bitmapfont

[cyotek]

Initial results from the Allocations branch. Better memory usage, slightly worse performance.

BenchmarkDotNet=v0.10.8, OS=Windows 10 Redstone 1 (10.0.14393)
Processor=AMD FX(tm)-6300 Six-Core Processor, ProcessorCount=6
Frequency=3429483 Hz, Resolution=291.5891 ns, Timer=TSC
  [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2101.1
  DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2101.1

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
LoadAuto	9.292 ms	0.2808 ms	0.7828 ms	187.5000	93.7500	15.6250	1.04 MB
LoadText	20.984 ms	0.4142 ms	1.0316 ms	1250.0000	31.2500	31.2500	2.18 MB
LoadXml	8.477 ms	0.1682 ms	0.4371 ms	203.1250	93.7500	15.6250	1.03 MB
V1LoadText	14.127 ms	0.2820 ms	0.5084 ms	2156.2500	15.6250	15.6250	3.7 MB
V1LoadXml	8.898 ms	0.2048 ms	0.5974 ms	187.5000	93.7500	15.6250	1.03 MB

[cyotek]

Initial results from the binary-format-support branch comparing loading binary fonts vs text/xml.

This branch is using a smaller font than the one in other branches so can't be directly compared with above results. Clearly binary is a winner however, as expected.

BenchmarkDotNet=v0.10.8, OS=Windows 10 Redstone 1 (10.0.14393)
Processor=AMD FX(tm)-6300 Six-Core Processor, ProcessorCount=6
Frequency=3429483 Hz, Resolution=291.5891 ns, Timer=TSC
  [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2101.1
  DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2101.1

Method	Mean	Error	StdDev	Gen 0	Gen 1	Allocated
LoadAutoBinary	365.0 us	7.215 us	14.410 us	16.1133	-	28.41 KB
LoadAutoText	3,338.5 us	65.871 us	87.936 us	460.9375	-	787.27 KB
LoadAutoXml	2,350.2 us	55.259 us	156.760 us	62.5000	19.5313	240.17 KB
LoadBinary	189.7 us	3.714 us	5.890 us	13.6719	-	23.81 KB
LoadText	3,023.7 us	64.865 us	124.974 us	457.0313	-	782.7 KB
LoadXml	1,998.3 us	48.459 us	139.038 us	70.3125	19.5313	235.58 KB

[cyotek]

Done via #18