[INTERNAL] sap.m.Panel: Move rules to base theme

Move all rules that are present in both BC and HCB
themes to the base theme.

Change-Id: If90fdf73e27b39c08ee3c0c052a39f9424df0cc6
Signed-off-by: Deyan Yanakiev <deyan.yanakiev@sap.com>
[INTERNAL] DatePicker additional small fix

- no need to parse and format again by pageUp/Down
- throw error if invalid date

Change-Id: Ic1cc5fc5918078f777f28d8e0f8e8bb9d51f024e
Merge "[INTERNAL] sap.m.Panel: Move rules to base theme"
Merge "[INTERNAL] DatePicker additional small fix"