add to_*

[ibarraespinosa]

• [ ] chimere_create
• [ ] to_chimere
• [ ] to_camx (https://github.com/atmoschem/eixport/issues/58)
• [ ] to_citychem (https://github.com/atmoschem/eixport/issues/57 https://github.com/atmoschem/eixport/issues/62)
• [ ] to_calpuff (https://github.com/atmoschem/eixport/issues/40)
• [ ] to_geoschem (https://github.com/atmoschem/eixport/issues/38)
• [ ] to_nhmchem (https://github.com/atmoschem/eixport/issues/37)
• [ ] to_nicamchem (https://github.com/atmoschem/eixport/issues/24)
• [ ] to_smoke (https://github.com/atmoschem/eixport/issues/8)
• [ ] to_cmaq (https://github.com/atmoschem/eixport/issues/9)
• [ ] _togains maybe a new model to download and resample global emissions inventories https://github.com/atmoschem/eixport/issues/50