Multisrc/madara

[nyagami]

• closes https://github.com/LNReader/lnreader-plugins/issues/840
• closes https://github.com/LNReader/lnreader-plugins/issues/762
• closes https://github.com/LNReader/lnreader-plugins/issues/620
• closes https://github.com/LNReader/lnreader-plugins/issues/618
• closes https://github.com/LNReader/lnreader-plugins/issues/516
• closes https://github.com/LNReader/lnreader-plugins/issues/498
• closes https://github.com/LNReader/lnreader-plugins/issues/461
• closes https://github.com/LNReader/lnreader-plugins/issues/350
• closes https://github.com/LNReader/lnreader-plugins/issues/864