Improved error reporting and formatting of debug output

[wfouche]

Closes #3

$ jbang run ../JythonCli.java  --cli-debug banner.py

[jbang] Building jar for JythonCli.java...

TOML data in Jython script:
     5 :# /// jbang
     6 :# requires-jython = "2.7.4"
     7 :# requires-java = "21"
     8 :# dependencies = [
     9 :#   "io.leego:banana:2.1.0"
    10 :# ]
    11 :# runtime-options = [
    12 :#   "-Dpython.console.encoding=UTF-8"
    13 :# ]
    14 :# ///

TOML data extracted from Jython script:
     1 :requires-jython = "2.7.4"
     2 :requires-java = "21"
     3 :dependencies = [
     4 :  "io.leego:banana:2.1.0"
     5 :]
     6 :runtime-options = [
     7 :  "-Dpython.console.encoding=UTF-8"
     8 :]

JBang command-line parameters:
    jbang
    run
    --java
      24
    --runtime-option
      -Dpython.console.encoding=UTF-8
    --deps
      io.leego:banana:2.1.0
    --main
      org.python.util.jython
    org.python:jython-slim:2.7.4
    banner.py

['banner.py']

[wfouche]

Error reporting is improved as well when an invalid TOML data block is parsed.

$ jbang run ../JythonCli.java  --cli-debug banner.py

TOML data in Jython script:
     5 :# /// jbang
     6 :# requires-jython = "2.7.4"
     7 :# requires-java = "21"
     8 :# dependencies = [
     9 :#   "io.leego:banana:2.1.0"
    10 :# ]
    11 :# runtime-options = [
    12 :#   "-Dpython.console.encoding=UTF-8"
    13 :# ///

TOML data extracted from Jython script:
     1 :requires-jython = "2.7.4"
     2 :requires-java = "21"
     3 :dependencies = [
     4 :  "io.leego:banana:2.1.0"
     5 :]
     6 :runtime-options = [
     7 :  "-Dpython.console.encoding=UTF-8"
Unexpected end of input, expected ], a comma, or a newline (line 7, column 36)
java.io.IOException

[wfouche]

@jeff5 , apologies for the delay in resubmitting the changes that got lost in the pull request fiasco.

[wfouche]

I'll close this PR, and resubmit it as two distinct PRs