Consistently use 0/1/2 for tristate values

Easier to work with, allowing e.g. direct comparisons with < and >. Make
set_value() take 0, 1, 2 for bool and tristate symbols, and fix other
APIs to match.

Also:

  - Add introductions to various concepts in the module docstring.
    Document some more attributes. Still TODOs.

  - Rename the Config class to Kconfig.

  - Escape " and \ in the name of constant symbols when printing them.
    Also make the (un)escaping 100% consistent with how the C tools do
    it (\ before non-magic character should be unescaped too).

  - Clean up the escaping/unescaping code and provide two public
    escape()/unescape() functions.

  - Export the original MODULES-independent type in orig_type. It's
    needed for printing symbols in the reparsable __str__() Kconfig
    format with just public APIs.

  - Lots of other minor reorganizing and nits all over.

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