Renamed the README, LICENSE and ignore rules
Removed .hgtags
Moved the .nuget folder under /src
Renamed '_logo' to /docs
Renamed '_externals' to /lib
Renamed '_build' to /package
Moved the NuGet packages folder to under /src
Moved all the source-code to under /src
Updated ignore rules
Moved the 'MSBuildTasks' to under the /tools folder
Renamed the build script files
Removed code which has been replaced by `SafeMailLink.Core`.

Using `IL-Repack` to merge into a single assembly.
Modified the package build script.

Bumped version number to v2.0.0 (breaking changes, due to code removal)