Modularize lib crate with sub crates: sic edition

[foresterre]

• Parser module & combostew re-export (issue: Modularize lib crate with sub crates: parser module #119 , PR: Put the parser module in its own crate. #117)
• module: help (issue: Modularize lib crate with sub crates: user manual module #121, PR: Restructure and modularize the built-in user manual help pages. #122)
  • remove ProcessWithConfig from crate (issue: #?, PR: #?)

Future:

Look into adding the combostew modules as crates in this repository. Publish these crates as appropriate on crates.io, use from sic with path = ".../combostew_{X}" :

• combostew >> module: n_0
• combostew >> module: n_1
• combostew >> module: n_2