Transpiler unit tests and bug fixes

[chadsec1]

This PR adds unit tests to the transpiler layer, and fixes some bugs, notably the typo #11

It also makes variables locked by default if they're expliclitiy initialized like: own x int32 = 1
but if they're implicility initialized, they're unlocked, because the programmer is most likely going to assign to them, like: own x int32

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 302 complexity · 95 duplication

Metric	Results
Complexity	302
Duplication	95

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🟢 Coverage 100.00% diff coverage · +8.34% coverage variation

Metric	Results
Coverage variation	✅ +8.34% coverage variation (-1.00%)
Diff coverage	✅ 100.00% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (48d8b0c)	2881	2485	86.25%
Head commit (869d0e4)	3036 (+155)	2872 (+387)	94.60% (+8.34%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#12)	172	172	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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