Inspection for execution sections in 'use' section

[dakochik]

If an execution section appears in 'use' section, we are getting misleading message:

But in this case, snakemake prints an error with message: "Unexpected keyword shell in rule definition"
So, we need to add a more appropriate message.
Related to #355

[iromeo]

Similar for subworflows:

subworkflow foo:
    input: ""

See ..../python3.8/site-packages/snakemake/parser.py

        if is_name(token):
            try:
                if token.string == "snakefile":
                    self.has_snakefile = True
                if token.string == "workdir":
                    self.has_workdir = True
                for t in self.subautomaton(token.string).consume():
                    yield t
            except KeyError:
                self.error(
                    "Unexpected keyword {} in "
                    "subworkflow definition".format(token.string),
                    token,
                )

[iromeo]

For module, see Module.block_content(), ModuleReplacePrefix, ModuleSkipValidation ModuleConfig, ModuleMetaWrapper, ModuleSnakefile

    def block_content(self, token):
        if is_name(token):
            try:
                if token.string == "snakefile":
                    self.has_snakefile = True
                if token.string == "meta_wrapper":
                    self.has_meta_wrapper = True
                for t in self.subautomaton(token.string).consume():
                    yield t
            except KeyError:
                self.error(
                    "Unexpected keyword {} in "
                    "module definition".format(token.string),
                    token,
                )

For Use, see UseRule.block_content. AFAIU supported sections is taken from variable:

rule_property_subautomata = dict(
    name=Name,
    input=Input,
    output=Output,
    params=Params,
    threads=Threads,
    resources=Resources,
    priority=Priority,
    version=Version,
    log=Log,
    message=Message,
    benchmark=Benchmark,
    conda=Conda,
    singularity=Singularity,
    container=Container,
    containerized=Containerized,
    envmodules=EnvModules,
    wildcard_constraints=WildcardConstraints,
    shadow=Shadow,
    group=Group,
    cache=Cache,
    handover=Handover,
)

[dakochik]

Fixed:

[iromeo]

@dakochik Please add short feature demo (png or gif)

[dakochik]

Done: