1.8.0

(1). Modularize smk files, and move all smk files into the folder "files/smk".
(2). Move demultiplex.smk into folder "files/smk".
(3). Tested m3c, m3c-multi, mc,mc-multi both on local and GCP
(4). Tested mct.smk
(5). Updated env.yaml and added env_greedy.yaml to fix bug for subread (2.0.1)
(6). Updated cell_parser_hisat_se_summary and columns in mapping summary files