tum-ens/bipmo: Initial release

Initial BiPMo release Features:

• Simulation of biogas production given different parameters
• Optimal plant operation including feeding regime over a given planning horizon based on price time series as linear program or mixed integer linear program
• Two biogas plant models implemented: Simple model with constant biogas production and a flexible biogas plant model with flexible feeding regime
• Generate plots for all control variables and outputs
• Repository includes example scripts for biogas production and optimal operation