Fix number parsing and raising decimal to large power. #774

Fix number parsing and raising decimal to large power.

Usage Workflow file

15 warnings

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Test: src/func/mod.rs#L33

unused imports: `locked_read`, `locked_write`, `shared_try_take`

Test: src/parser.rs#L21

unused import: `FnArgsVec`

Test: src/tokenizer.rs#L1594

unused variable: `has_period`

Test: src/tokenizer.rs#L1595

unused variable: `has_e`

Test: src/tokenizer.rs#L1594

variable does not need to be mutable

Test: src/tokenizer.rs#L1595

variable does not need to be mutable

`rhai` (lib test) generated 6 warnings (6 duplicates)

Test: examples/arrays_and_structs.rs#L8

unused imports: `Engine`, `EvalAltResult`

`rhai` (example "arrays_and_structs") generated 1 warning (run `cargo fix --example "arrays_and_structs"` to apply 1 suggestion)

`rhai` (example "pause_and_resume") generated 1 warning (run `cargo fix --example "pause_and_resume"` to apply 1 suggestion)

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