Config: Customize default export folder (Both Normal Export & Quick Export)

[dark-person]

Support user to choose directory that output:

• .cbz file
• .cbz file that wrapped with folder

If user keep blank for this setting, then default setting will be used (export inside image directory). This will be handle by proposal in issue #63

Config Proposal

Provide a new config value:

• comic_directory_standard: Apply to normal generate process
• comic_directory_quick : Apply to Quick Export ONLY

Notes

Consider allow user to define multiple comic_directory_standard from config, while comic_directory_quick must be ONE only.