awebshell library: Add Support For Nested Commands

[waterimp]

1. Add support for commands of the forms like:
   COMMAND_NAME { SUB_COMMAND_NAME arg1 arg2 arg3.. } arg4 ..
2. Add support for Web Shell URLs that contain forms like {COMMAND_NAME args...}.

This also means to do things under the hood like...

1. Add ability to recursively execute sub commands and retrieve (scrape) results.
2. Develop inlining feature to speed up 'kernel' commands.
3. Develop page scrape functionality required.
4. Develop some sort of safety/security and timeouts related to scraping remote websites.