Add app_config()/app_reader()/app_writer() and prelude to template #52
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Adds a set of accessors to the application template: - `app_config()`: obtain a `config::Reader` for reading app config - `app_reader()`: obtain a concurrent read-only lock on app state - `app_writer()`: obtain an exclusive mutable lock on app state Additionally it adds a `prelude` module to each application which is useful for easily importing common application-specific types/macros.
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Adds a set of accessors to the application template:
app_config(): obtain aconfig::Readerfor reading app configapp_reader(): obtain a concurrent read-only lock on app stateapp_writer(): obtain an exclusive mutable lock on app stateAdditionally it adds a
preludemodule to each application which is useful for easily importing common application-specific types/macros.