Issue title: Generate CMake toolchains from Python code
 Issue body: Use toolchains table from https://github.com/ruslo/polly/blob/master/bin/detail/toolchain_table.py to generate actual CMake code:
- Generate name of the toolchain file
- Generate human-readable toolchain name
- Include CMake modules automatically
- ...

 Comments: 
 Comment 0: Add HUNTER_TOOLCHAIN_UNDETECTABLE_ID automatically
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{'source': 'GithubIssues', 'repo_name_with_owner': 'ruslo/polly', 'issue_id': 94543885, 'repo_stars': 829.0}