[CUBRIDQA-1203] Refining execute.c and adding PL/CSQL parsing

[hyunikn]

http://jira.cubrid.org/browse/CUBRIDQA-1203

• code refinements
  • adjust include and lib directories paths considering cubrid-cci submodule addition (this will be canceled by CBRD-25126)
  • git ignore geneated binary files execute and ccqt and a generated header file interface_verify.h
  • use memmove instead of two memcopy's in trimline()
  • disallow -- holdcas on/off : there are no such directives in the TCs
  • allow --+holdcas on/off (note no space between --+ and holdcas) : there are TCs which have them
  • remove unnecessary variable 'iscallwithoutvalue'
  • simplify iscomment() function
  • simplify endwith() function and rename it to endswithsemicolon()
  • rename char_cmp() to startswith()
  • add startswithCI() : CI for Case Insensitive
  • use stack instead of heap for str_tmp, and rename str_tmp to sql_buf
  • rename linelength to sql_len
  • trim input string line at the start of every iteration of the while loop in readFile() to avoid repeated trimming later
  • exit when whole sql line overflows str_buf
  • avoid the repeated call of trimline(p) in formatplan() function
• add PL/CSQL parser - line_scanner.c which is copied from CUBRID's csql_support.c, and is distilled.
• fix a segmentation fault in ccqt