SC: labels for former connectors

[yakra]

Found some vestigial waypoint labels for old Connector routes no longer in the HB.
This isn't an exhaustive list of all of`em, just those I noticed marked as a datacheck FP.

US1:   US1/21Con -> ChaHwy
US15:   US15/301Con -> DukSt
US21:   US21/76Con -> HugSt_S or BloSt_E
US29:   US29/20Con -> US29Con (assuming it's still signed; didn't check GMSV)
US301:   US301/521Con -> TriChuRd

[Markkos1992]

US1:   US1/21Con -> ChaHwy

This would impact SC 35, SC 602, US 21, US 176, and US 321 as well.

US15:   US15/301Con -> DukSt

This would also be the case for US 301.

US21:   US21/76Con -> HugSt_S or BloSt_E

This would be the case for US 176 and US 321 as well.  It would also impact SC 48, US 76, and US 378.

US29:   US29/20Con -> US29Con (assuming it's still signed; didn't check GMSV)

Still signed as of June 2021.

US301:   US301/521Con -> TriChuRd

Looks the corresponding US 521 point would be MainSt.

New:

US 76: US76Con -> RosDr

This would also affect US 378 and SC 16.

[mapmikey]

Note that the US 15 CON in Summerton is signed such that it can be a label but not a clinchable route in TM under current practice - https://goo.gl/maps/Adv5n3RgTdYPbN2dA

The same is true for the US 301 CON in Alcolu - https://goo.gl/maps/sbVboWQtZrg5wBxC6

Other instances below were changed to regular street names...

[yakra]

Reminds me of "State Route 129", which extends south of actual ME129, although there are no signs to the south. And no other routes to intersect.

[Markkos1992]

The following still needs to be done from what I see:

US 29:  US29/20Con -> US29Con (since it is still signed)
SC 48:  US21Con>-BloSt

[yakra]

US15 & US301 are still unchanged. Unsure if the intent was to change or leave as-is...

US15:   US15/301Con -> DukSt

Or not -- It's signed as Railroad Ave. And Oh Look -- there's another street blade (that same dark color again) for US15Con. With dual signage like this existing, how would that affect things?
On US301, I see 3 separate "301 Con" blades and 1 for Trinity Church.

[mapmikey]

US15 & US301 are still unchanged. Unsure if the intent was to change or leave as-is...

US15:   US15/301Con -> DukSt

Or not -- It's signed as Railroad Ave. And Oh Look -- there's another street blade (that same dark color again) for US15Con. With dual signage like this existing, how would that affect things?
On US301, I see 3 separate "301 Con" blades and 1 for Trinity Church.

Any which have a black blade (same marker for innumerable secondary labels used) with the CON designation I am leaving alone.  US 21 CON in Ridgeway is also signed this way.

There is actually US 301 CON 1 and US 301 CON 2 in Alcolu but I am not differentiating them for the purpose of waypoint labels.

[mapmikey]

The following still needs to be done from what I see:

US 29:  US29/20Con -> US29Con (since it is still signed)
SC 48:  US21Con>-BloSt

made these changes