Runtime Contexts

[Washi1337]

Includes

• RuntimeContext class, allowing for simulating a runtime environment that shares a single assembly resolver and file service for all loaded modules involved.
• ModuleReaderParameters::RuntimeContext, specifying which context the module should be read in.
• BundleAssemblyResolver, allowing for assemblies to be resolved within a BundleManifest.
• Bugfix for facades assembly resolution on Mono.

Closes #471

[Washi1337]

Initial testing/benchmarking seems to yield promising perf gains.

Two assemblies in the same context trying to resolve the same System.Object type result in 22% memory consumption reduction:

Method	UsingRuntimeContext	Mean	Error	StdDev	Gen0	Gen1	Gen2	Allocated
ResolveSystemObjectInTwoAssemblies	False	15.968 ms	0.4843 ms	1.4051 ms	1093.7500	1062.5000	906.2500	22.95 MB
ResolveSystemObjectInTwoAssemblies	True	9.157 ms	0.1772 ms	0.1570 ms	1031.2500	1015.6250	953.1250	17.68 MB