Both enums (index) and defines (mask) exist for event type

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Is your feature request related to a problem? Please describe.
Having both the mask and the index requires keeping them in sync.

Event type bitmasks:

cFE/modules/evs/fsw/inc/cfe_evs_msg.h

Lines 898 to 902 in c8b5e00

	/* Event Type bit masks */
	#define CFE_EVS_DEBUG_BIT 0x0001
	#define CFE_EVS_INFORMATION_BIT 0x0002
	#define CFE_EVS_ERROR_BIT 0x0004
	#define CFE_EVS_CRITICAL_BIT 0x0008

Event type enum:

cFE/modules/core_api/fsw/inc/cfe_evs_extern_typedefs.h

Lines 90 to 122 in c8b5e00

	/**
	* @brief Label definitions associated with CFE_EVS_EventType_Enum_t
	*/
	enum CFE_EVS_EventType
	{
	/**
	* @brief Events that are intended only for debugging, not nominal operations
	*/
	CFE_EVS_EventType_DEBUG = 1,
	/**
	* @brief Events that identify a state change or action that is not an error
	*/
	CFE_EVS_EventType_INFORMATION = 2,
	/**
	* @brief Events that identify an error but are not catastrophic (e.g. - bad command
	*/
	CFE_EVS_EventType_ERROR = 3,
	/**
	* @brief Events that identify errors that are unrecoverable autonomously
	*/
	CFE_EVS_EventType_CRITICAL = 4
	};
	/**
	* @brief Identifies type of event message
	*
	* @sa enum CFE_EVS_EventType
	*/
	typedef uint16 CFE_EVS_EventType_Enum_t;

Describe the solution you'd like
Collapse to one solution, either use the mask or the enums. Related to #1438 and #1398.

Describe alternatives you've considered
Or use one to create the other so they don't get out of sync.

Additional context
Code review

Requester Info
Jacob Hageman - NASA/GSFC

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Related to #1398, need to sort out ENUM vs mask use