Remove Science funding

[I_like_pie]

Completed! Thanks for suggesting it.

Note: this is specifically for a date-based delay. Disabling it for an entire round requires slightly different handling, but can be faked in the meantime by just specifying a date further out than EoR.

New Galaxy Setting: Delayed Research Funding

As requested, we now have a new galaxy setting that will delay the ability to directly fund research. When enabled, all empires will see the following message on their science page until the date specified by the galaxy creator: This galaxy does not yet allow cash funding of scientists. Please check again later. Research Centers are unaffected and can still be built as usual. Thank you @HydroP for suggesting this feature.