Impl Into<ProjectivePoint> for EcPoint

[coveralls]

Pull Request Test Coverage Report for Build 7084773077

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.06%) to 80.777%

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Files with Coverage Reduction	New Missed Lines	%
ergotree-ir/src/serialization/types.rs	8	79.79%
<!--	Total:	8		-->

Totals
Change from base Build 7068108616:	0.06%
Covered Lines:	10602
Relevant Lines:	13125

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💛 - Coveralls