#ENTITY_GATE_SWAP_GROUP
Defines whether a gate can be swapped with other gates of the same unit.

Gates in swap group 0 can't be swapped at all.

Gates in a nonzero swap group can be swapped with other gates of the same swap group and unit.

#ENTITY_GATE_SUFFIX
Suffix that gets appended to the reference designator, for example U101B.

Leave blank for single-gate entities. Use A,B,C,… for multi-gate entities.

If there's a gate dedicated to power supply, its suffix should be P.

#ENTITY_GATE_NAME
If there's only a single gate, its name should be "Main".

#UNIT_PIN_ALT_NAMES
If a pin has multiple functions, add these here, separated by spaces.

For example: Pin name: PB0, alternate names: I2C0_SDA ADC2_IN.

#POSITION_FORMAT
<tt>printf</tt>-style formatting for positions.

<tt>%.</tt>&lt;precision&gt;&lt;unit&gt;
precision: number of decimal places 0...9
unit: <tt>m</tt>: millimeter, <tt>i</tt>: inch, <tt>t</tt>: thou/mil, <tt>u</tt>: micrometer

#SYMBOL_CAN_EXPAND
Set this for box-style symbols if there are alternate pin names or the user is expected to add custom pin names. In this case, size the symbol such that it fits the primary pin names.
