Qocogen

- Fix conflicting function names and conflicting header guards

Added Windows support (https://github.com/qoco-org/qocogen/pull/2)

- Fix bug when `0` is in `P.data`, `A.data`, or `G.data`
- The bug fix is needed to pass portfolio optimization unit tests with seeds 0 and 1 in `cvxpygen`

- Added exact linesearch
- Fixed settings display

Added `update_data` functions.

- Fixed the way relative gap error was computed