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Partial fix of #274

This installs the in-tree Cabal into the cabal-sandbox before building
hadrian itself. This only works if the installed cabal version is < 1.24,
because I have not yet figured out how it can be done with the newly
introduced `new-build` command.

Hadrian should be built with a local Cabal from within the
GHC codebase. This makes the stack pick it up, instead of
using the released version of Cabal.
Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

See #268.

See #259, #268.

Fix #247

The defaul user settings are stored in ./src/UserSettings.hs. If the
user want to override these settings, he can copy this file into ./ and
make the desired changes to ./UserSettings.hs.

See #234.

[skip ci]

See #230.

See #222, #223.

See #207.

See #207.

See #204.

See #200.

See #187.

We need this so cabal (this is even more important with the upcoming
nix-style cabal features) can do a proper job so this is a pre-requisite
for the new build-system being used by default for GHC anyway, as we
need to be as accurate as possible with the build specification to give
`git bisect` a chance of remaining usable.

Fix #191.

Fix #131.

Fix #176.