Match filename in xvlog linter and add tip

[gastmaier]

Match the xvlog stdout for the filename to properly filter out the errors per file.
Suggest using Vivado generated compile.sh file to obtain the xvlog options.

For reference, the sane way of using xvlog is along these lines:

let g:ale_verilog_xvlog_options = '
\ --incr --relax \
\ -L uvm -L axi_vip_v1_1_15 -L smartconnect_v1_0 -L clk_vip_v1_0_3 -L axi4stream_vip_v1_1_15 -L rst_vip_v1_0_5 -L xilinx_vip
\ -prj ./path/to/xsim/system_tb_vlog.prj'

Room for improvement:
The .prj uses relative paths and expects xvlog to be called from its path.
As is, I'm manually "fixing" the relative paths in the .prj to point from the cwd to xsim.
Not sure if it's worth a more elaborated solution (e.g. search for the compile.sh, set cwd to its location, and extract the xvlog options.

[stale]

This pull request has been automatically marked as stale because it has not been updated recently. Make sure to write tests and document your changes. See :help ale-dev for information on writing tests.
If your pull request is good to merge, bother w0rp or another maintainer again, and get them to merge it.