Replace QOlmError with OlmErrorCode

QOlmError represents a subset of OlmErrorCode, and the associated
fromString() function uses undocumented strings produced inside Olm;
meanwhile OlmErrorCode is documented in its own header file. Each QOlm*
class now has lastErrorCode() next to lastError() (that, from now,
returns a textual representation straight from Olm, not QOlmError enum).

Also: including olm/error.h in e2ee/e2ee.h required some rearrangement
of the code to make sure non-E2EE configuration still builds.

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