implement more methods in remix-sim

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Udapp as class

update with latest links to readthedocs

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removed 'detail' key of optimizer for versions before yul

[WIP] Add more position conversion functions

Fix #950

- type LineColPosition,
- type LineColRange,
- function lineColPositionFromOffset
- function srcToLineColumnRange

And associated tests for these

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output ast from compilation result

use babel 7

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Enable yul optimizations if optimizations are enabled and in Yul mode.