ci: Rework of shell ci

[jamacku]

New features:

• add ability to ignore specific warnings
• ci test files containing shebang #!/bin/bash or #!/bin/sh
• ci test files with .sh extension
• add ability to use inline comments in list files
• use of colors in output
• make code cleaner

Bug fixes:

• ci now checks only shell scripts

[jamacku]

Output from CI:

Added bugs, NEED INSPECTION:

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:10:27: error: Don't quote rhs of =~, it'll match literally rather than as a regex. [SC2076]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:46:9: warning: Variable was used as an array but is now assigned a string. [SC2178]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:50:10: warning: Expanding an array without an index only gives the first element. [SC2128]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:50:10: note: Double quote to prevent globbing and word splitting. [SC2086]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:55:1: warning: NOCOLOR appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:56:1: warning: RED appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:57:1: warning: GREEN appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:58:1: warning: ORANGE appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:59:1: warning: BLUE appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:60:1: warning: YELLOW appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:61:1: warning: WHITE appears unused. Verify it or export it. [SC2034]

[jamacku]

Output from CI:

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:11:27: error: Don't quote rhs of =~, it'll match literally rather than as a regex. [SC2076]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:76:9: warning: Variable was used as an array but is now assigned a string. [SC2178]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:81:10: warning: Expanding an array without an index only gives the first element. [SC2128]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:81:10: note: Double quote to prevent globbing and word splitting. [SC2086]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:86:1: warning: NOCOLOR appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:87:1: warning: RED appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:88:1: warning: GREEN appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:89:1: warning: ORANGE appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:90:1: warning: BLUE appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:91:1: warning: YELLOW appears unused. Verify it or export it. [SC2034]

Error: SHELLCHECK_WARNING:

./.ci/functions.sh:92:1: warning: WHITE appears unused. Verify it or export it. [SC2034]

[jamacku]

Fixes #329