Split the cost matrix data from technology properties

In many of our models, we include non-cost data in our cost matrix. For instance, in the power sector, we include whether a variable is a variable renewable resource in that table, and whether it is storage. This is a confusing place to save this data. Some similar data is hardcoded. For instance, we have solar-specific behaviour that is hard-coded with indices in the text. A better solution would be to create a power_tech_props csv file with only this data.

This work will be easier after #238 is resolved (new data loading). These props also do not need to be done per country, saving us some space.