Multiplatform Migration

[DatL4g]

• migrated the base project to multiplatform.
• renamed "Flower" to "flower-core"
• Success data is a Definitely Non-Nullable Type now
• return Empty if Success is empty
• all resource status types are classes now
• renamed "networkBoundResource" to "dbBoundResource"
• renamed "shouldFetchFromRemote" to "shouldMakeNetworkRequest"
• renamed "fetchFromRemote" to "makeNetwotkRequest"
• renamed "processRemoteResponse" to "processRequestResponse"
• renamed "saveRemoteData" to "saveRequestData"
• renamed "onFetchFailed" to "onRequestFailed"
• added Ktorfit compatibility
• removed gradle-nexus-plugin
• README image is now white if darkmode is enabled
• gradlew is executable now (unix systems)

[DatL4g]

We can't get rid of wrapping the ApiResponse in a Flow as this would break the Ktorfit compatibility

[DatL4g]

The publication needs to be tested. I think I configured it correctly, however I didn't test it

[hadiyarajesh]

Thanks @DATL4G for this valuable commit. I've created a separate branch for this new-architecture (v3.0) and we should commit to it. I would like to propose few points

1. rename "processRequestResponse" to "processNetworkResponse"
2. rename "saveRequestData" to "saveNetworkData"
3. rename "onRequestFailed" to "onNetworkRequestFailed"