the instanced_inf_table generator did not account for the fact that
library class instances can choose to only support phases.

This commit adds that support in two phases:

1. Updates the DSC parser's ScopedLibraryDict to store a list of
instances that match the scope, instead of the first instance it finds.

2. The instanced_inf_table generator now checks the list of instances (
    in order of appearance in the DSC) to find the first instance that
    matches the scope, but also supports the specific phase.

Due to platforms performing complex includes in their DSCs, There is a
scenario in which a library instance references a library class that
does not exist. This is not an error as the library class instance may
not be consumed by a component in the platform, so the missing
dependency is acceptable.

This commit adds the ability to handle this scenario, and will not raise
an error for a missing library instance.

The LIBRARIES_USED column in the instanced_inf table only contained
the the edk2 relative path to the library instance. This made it
impossible to determine (with 100% accuracy) which library class the
particular library instance was representing.

This commit changes the "LIBRARIES_USED" column to contain a list of
(lib_class, lib_instance) tuples rather than a list of lib_instances.

Tests

Previously, the library class name for a library INF was not included
in the table. This commit adds that information to the table as a row
to make it easier to find the library class name for a library INF.

the instanced_inf_table generator did not account for the fact that
library class instances can choose to only support phases.

This commit adds that support in two phases:

1. Updates the DSC parser's ScopedLibraryDict to store a list of
instances that match the scope, instead of the first instance it finds.

2. The instanced_inf_table generator now checks the list of instances (
    in order of appearance in the DSC) to find the first instance that
    matches the scope, but also supports the specific phase.

Due to platforms performing complex includes in their DSCs, There is a
scenario in which a library instance references a library class that
does not exist. This is not an error as the library class instance may
not be consumed by a component in the platform, so the missing
dependency is acceptable.

This commit adds the ability to handle this scenario, and will not raise
an error for a missing library instance.

The LIBRARIES_USED column in the instanced_inf table only contained
the the edk2 relative path to the library instance. This made it
impossible to determine (with 100% accuracy) which library class the
particular library instance was representing.

This commit changes the "LIBRARIES_USED" column to contain a list of
(lib_class, lib_instance) tuples rather than a list of lib_instances.

Tests

Previously, the library class name for a library INF was not included
in the table. This commit adds that information to the table as a row
to make it easier to find the library class name for a library INF.

When parsing an FDF file, an INF can be prepending with a RuleOverride
directive. The previous functionality to ignore this directive and
retrive the actual INF value could not handle any spaces in the
directive (such as RuleOverride = ACPITABLE). This commit expands the
ability to handle spaces in the directive.

…_table' of https://github.com/javagedes/edk2-pytool-library into bugfix-instanced_inf_table