Remove a redundant indentation
Refactoring and code tidyup in preparation for future additions

* Renamed a number of variables in sslhaf_cfg_t in preparation for more
  variables in future.  Also some name changing:
    cslen -> suites_len
    compression_methods -> tcompmethods as it is a printable string
    extensions -> textensions as it is a printable string
* A number of stack variables in decode_packet_v3_handshake are renamed
  in order to make their purpose clearer thus code flow more readable.
  Using names such as: msg_len, section_to_go, sub_section_to_go
* Reuse some counter/offset variables as their naming eg. section_to_go
  as there may be many sections in a message, and this usage helps the
  reader to understand the code
* Standardise on usage if array indexing instead of deref pointer +
  offset when combining multiple array elements into a numeric value,
  for example: *(p + 1) -> p[1], numerous usages of the * operator
  remain where they are trivial
* mylen -> msg_to_go, make this variable follow the progress of 'p'
  more closely, eg. when p is incremented, decrement msg_to_go straight
  away instead of a large decrement at the end of a while loop