hal: Deprecate old HAL API

[BsAtHome]

The getter/setter infrastructure is in place and the next stage is to warn about any use of the old API. With this PR, the HAL header now marks the old API as deprecated, including:

• hal_data_u
• hal_{bit,float,u32,s32,u64,s64}_t
• ireal_t
• hal_pin_*_new[f]()
• hal_pin_new()
• hal_param_*_new[f]()
• hal_param_new()
• hal_param_set*()
• hal_get_{pin,param,signal}_value_by_name()

The HAL library uses #pragma GCC diagnostic to prevent the deprecation warning from popping up when compiling the library or other when including hal.h. Only use of the old API will result in a warning.

The HAL_XXX type names, like HAL_S32 and others, are still valid and will be dealt with later. These are somewhat more involved to get streamlined and require breaking the API when done properly. A new (large) patch set will be prepared to move to the next stage before the next wave of PRs. In the meantime, the deprecation messages will inform users to start moving and prepare for what is coming.