Custom Ascii art file format

As of #298 neofetch now uses the distro ascii format for custom ascii files.

Here's an example:

"\
${c1}                 ;\'-.
     \`;-._        )  \'---.._
       >  \`-.__.-\'          \`'\'__
      /_.-\'-._         _,  ${c2} ^${c1} ---)
      \`       \`\'------/_.\'----\`\`\`
"

Rules:

• The ascii art must be kept inside quotes like above.
  • "\ as the opening
  • " as the ending
• You have to escape these characters:
  • \, ', ", `
• You can use ${c1} to ${c6}to color the ascii.
• You can pass the flag --ascii_colors 1 2 3 4 5 6 to set the colors.
  • This changes the values of ${c1} to ${c6}
  • --ascii_colors 2 5 6 1 changes ${c1} to Green, ${c2} to Magenta and etc.