Commits on Jan 29, 2020

1. More macro search changes …

   Unify the lookup for the various macros, all of them are done in the manifest now:
    - dbt's built-in package + all plugins are part of 'core'
    - finding macros has the concept of an optional package name
    - materializations are a special case of finding macros
    - the `generate_*_name` macros are another special case (non-core dependency packages are ignored)
    - generating the macro execution context now uses the concept of an optional search_package_name
    - macro execution now binds these two together
   
   Unify the lookup for models/docs/sources
    - added a search_name property to those three types
    - create a 'Searchable' protocol, have the node search code accept that
    - simplify matching logic/push it into the correct types accordingly
   
   Rename get_materialization_macro to find_materialization_macro_by_name (consistency)
   
   context namespacing behavior:
    - dbt run-operation now passes the named package along to macro execution if a package name is specified
    - so `dbt run-operation dependency.ad` runs with the dependency namespace as local, overriding globals
    - but `dbt run-operation my_macro` runs in the current package namespace as local, even if it ultimately runs the dependency's my_macro()
    - the current package namespace is always treated as "global", overriding core macros
   
   Tons of tests

   Jacob Beck committed Jan 29, 2020
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