Research calculations are off when research points available change from turn to turn

**Describe the bug**
If the number of research points available for a tech changes from turn to turn, the ETA is thrown off, as it assumes that the points available on one turn are the same as the points available on subsequent turns.

This can happen in two scenarios:
* Bonus research points on the first turn (from game setup) are assumed to carry over and be available on subsequent turns, even though they're a one time bonus.
* When completing tech A and starting tech B, the points allocated to tech A on the first turn are deducted from future turns' contribution to tech B, even though tech A is completed.

**Steps to reproduce**
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**Expected behavior**
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**Actual behavior**
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**Screenshots**
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**Related issues**
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**Testing plan**
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**Additional context**
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