Convert all the helpers to snake_case, deprecate the ones that don't follow that, and add a unit test.

Adding if_manufacturing_specific_cluster helper to return data based on whether the cluster is manufacturer specific or not

JIRA: ZAPP-345

- Adding ifCommandArgumentsExist to return strings based on whether command arguments exist or not
- Creating a mechanism under asUnderlyingZclType helper to output characters associated with different zcl data types such as 'u', 'l', 's' to generate the client command macros
- JIRA: ZAPP-345

Add 'presentIf' field inside the db and expose it to the templates

Silabs

Fix a typo when mapping the atomics discrete property from the databa…

Expose the 'writable' field of attributes to templates

Silabs

Silabs