concat filename and line number with colon for better redirection

[leibnewton]

Thanks for adopting previous pull request.

I noticed that the filename is also added to the message. And I come up with this further improvement. So that we can make redirection to source code line by "Cmd+Click" on editors such as VSCode.

The following is the sample output:

INFO: Start testsuite << FFD Testsuite >> (@ 0) (ffd_testbench.sv:53)

INFO: Starting << Test 0: Check reset is applied >> (@ 0) (ffd_testbench.sv:74)
I will test if Q output is 0 after reset (@ 100000) (ffd_testbench.sv:76)
SUCCESS: Test 0 pass (@ 110000) (ffd_testbench.sv:81)

INFO: Starting << Test 1: Drive the FFD >> (@ 110000) (ffd_testbench.sv:83)
I will test if Q output is 1 after D assertion (@ 210000) (ffd_testbench.sv:85)
SUCCESS: Test 1 pass (@ 236000) (ffd_testbench.sv:94)

INFO: Stop testsuite 'FFD Testsuite' (@ 236000) (ffd_testbench.sv:96)
  - Warning number:  0
  - Critical number: 0
  - Error number:    0
  - STATUS: 2/2 test(s) passed

ffd_testbench.sv:118: $finish called at 236000 (1ps)
SVUT (@ 22:47:49) Stop ffd_testbench.sv

SVUT (@ 22:47:49) Elapsed time: 0:00:00.087769

[dpretet]

Good to me :)