Code improvement: regex centralization

[atsju]

several regex to find STM families are reused at many places. It's complex to maintain.

We should create some functions to have regex at one place and easier to reuse.

[xanthio]

Here is a proposition for a single place regex function:

function(stm32_extract_info identifier)
    set(ARG_OPTIONS "")
    set(ARG_SINGLE FAMILY DEVICE FLASH_CODE CORE)
    set(ARG_MULTIPLE "")
    cmake_parse_arguments(PARSE_ARGV 1 INFO "${ARG_OPTIONS}" "${ARG_SINGLE}" "${ARG_MULTIPLE}")

    string(REGEX MATCH "^(STM32)?([CFGHLU][0123457]|MP[12]|WL|WB[0A]?)([0-9A-Z][0-9M]?)?([A-Z135])?([3468ABCDEFGHIJYZ])?_?(M0PLUS|M4|M7)?.*$" ID ${identifier})
    set(FAMILY ${CMAKE_MATCH_2})
    set(SUB_FAMILY ${CMAKE_MATCH_3})
    set(PIN_COUNT ${CMAKE_MATCH_4})
    set(FLASH_SIZE ${CMAKE_MATCH_5})
    set(CORE ${CMAKE_MATCH_6})

    # message(STATUS "Parsed ${identifier} and got F ${FAMILY} S ${SUB_FAMILY} P ${PIN_COUNT} R ${FLASH_SIZE} C ${CORE}")

    if (INFO_FAMILY AND FAMILY)
        set(${INFO_FAMILY} ${FAMILY} PARENT_SCOPE)
    endif()
    if (INFO_DEVICE AND FAMILY AND SUB_FAMILY AND PIN_COUNT AND FLASH_SIZE)
        set(${INFO_DEVICE} ${FAMILY}${SUB_FAMILY}${PIN_COUNT}${FLASH_SIZE} PARENT_SCOPE)
    endif()
    if (INFO_FLASH_CODE AND FLASH_SIZE)
        set(${INFO_FLASH_CODE} ${FLASH_SIZE} PARENT_SCOPE)
    endif()
    if (INFO_CORE AND CORE)
        set(${INFO_CORE} ${CORE} PARENT_SCOPE)
    endif()
endfunction()

I changed a bit the original Regex to allow future support for MP2, WBA and WB0 families.
You should notice that devices which were 6 characters long (eg F100C4) can be 7 with family WBA (eg WBA52KE)